Vibrating screen



May 25, 1943. V HALL 2,319,901

VIBRATING' SCREEN Filed Oct. 11. 1939 2 sheets-sheet 1 Jesse 2912:?2? [791i INVENTOR ATTORNEY y 1943- J. P. HALL 2,319,901

' VIBRATING SCREEN Filed Oct. 1 1. 1939 2 Sheets-Sheet 2 Jesse 7%rafey .5911

'INVENTOR ATTORNEY Patented it, 25.1943 2 319 901 UNITED STATES PATENT OFFICE IVIBRATING SCREEN Jesse Pankey Hall, Barlow, Fla., assignor to Industrial Patents Corporation, Chicago, 11]., a

corporation of Delaware Application October 11, 1939, Serial No. 298,996

6 Claims.

This invent-ion relates to an improved vibrating screen.

One of the objects of this invention is to provide an improved vibrating screen [or the recovcry of phosphate ore.

Another object of the invention is to provide an improved underwater vibrating screen for the separation of coarse from fine material suchas gravel or sand.

necting cranks 45 and 52 is an L shaped link 54, one end being aflixed to crank 45 by means of crank pin 55 and the other end being inserted in bearing 56 in crank 52. Sand or gravel is fed into the apparatus by sand charging chute 51, the finer material being removed with excess water through opening l3 and the coarser material by means of discharge trough l4.

The device is operated by th motion supplied Other objects of the invention will be apparby the motor 41 which, by means of shaft 49 and ent from the description and claims which follow. reducing gears 49, rotates shaft 59. The uniform Reference is had to the drawings in which simspeed of rotation of shaft 59 is converted to a her characters are used to designate like e1e variable speed of rotation in shaft 49 by means ments. of the respective cranks 52 and 45 and the link Figure l is a perspective view of one embodi- 54 connecting the two cranks. This mechanism ment of the vibrating screen constructed in 3.0- provides a rotation of shaft 49 which is comcordance with the present invention. paratively rapid for approximately one half of Figure 2 is a longitudinal cross sectional view each revolution and comparatively slow for the of the present invention. balance of each revolution. This causes the mo- Figure 3 is a plan view partly in section of tion supplied to the rod 41, which is in turn at- Figure tached to screen l5, to be relatively rapid in Figure 4 is an enlarged detail drawing of the one direction and relatively slow in the other dilinkage between the source of power and the vimotion, and through the proper adjustment of brating screen. the mechanism results in the screen moving rap- The hopper l comprises side walls 2, 3, 4, and idly toward the charging end of the tank and 5, and bottom 5, resting upon cross pieces I and 9 afllxed to uprights 9, l9, II, and I2. Bottom 5 contains an opening l3 for-the discharge of sand and water and discharge trough I4 is alfixed to end wall 4.

Reciprocatable screen l5 comprising a relatively long horizontal portion l9 and a short inclined portion adjacent to the discharge end of the screen, operates within hopper I. The screen I5 'is hung by means of rods of approximately equal length |9, |9, 29 and 2| from cros pieces 22 and 23 aflixed to uprights 9 and ||..and I9 and I2 respectively. The upper end of each such rod l8, I9, 29 or 2| is respectively pivoted in bearings 24, 25, 25 and 21 in cross pieces 22 and 23, and the lower end is inserted in bearings 29, 29, 39 and 3| in lugs 32. 33, 34 and 35 attached to vibrating screen l5. At the discharge end of the screen is lug 36 to which i -attached rod 31 by means of bolt 39 and connected with an eccentric 39 revolving on shaft 49. Shaft 49 revolves in bearings 4| and 42 amxed by suitable means to uprights 43 and 44. Afllx'ed to one end of shaft 49 is crank 45 by means of set screw 49 or other suitablemeans. The entire apparatusisdriven by motor 41 attached to reducing gears 49 by means of shaft 49, reducing gears 48 operating shaft 59 revolving in bearing 5|. A small crank 52 is attached to shaft 59 by means of 'set screw 59 or other suitable means. Conslowly toward the discharging end of the tank. The screen I5 is hung in the hopper by the rods l9, I9, 29 and 2| so that the direction of movement of the screen is actually at a slight angle with the horizontal When the machine i in operation, each rotation of the shaft 49 causes the screen to move relatively rapidly toward the charging end, while dropping below the surface of the water, and then comparatively slowly return to a position at the discharge end and above the surface of the water. The movement toward the charging end-forms -countercurrents in the water which sweep the rocks or gravel toward the inclined discharge end of the screen. The screen then moves comparatively slowly so as not to disturb any of the material on the screen and returns to its original position above the surface of the water. The resistance of the water to the longitudinal movement of the screen and the material thereon serves to move the coarser material toward the discharge end and prevents the screen from binding while the finer material is dropped through the screen. Material to be classified is fed constantly on the screen from charging chute 51. The coarser material is constantly moved toward the discharge end of the machine and finally out through the discharge trough l4, while the finer material is p d through the screen and is removed through opening l3.

toward the feeding means, to

I claim:

1. A classifier having means to feed material to the classifier and a means to receive a portion of the classified material comprising a screen reciprocable between said feeding means and said receiving means to effect a separation of the particles of the material to be classified such that the larger particles are retained on the screen; said screen being generally horizontally disposed but having an upwardly inclined portion adjacent said receiving means; means to drive said screen rapidly in one direction; a body of liquid cooperating with said screen; means for directing the movement of the screen through said liquid for a substantial distance; said directing means causing said screen to be lifted out of the body of liquid adjacent said receiving means; and means associated with the screen to constrain the material to a path of movement over the screen as it is reciprocated; said drive means being operative to move said screen rapidly from 'its position nearest the receiving means to the position nearest the feeding means; whereby the material on the screen is subjected to a thorough agitation upon striking the liquid, is washed andgiven a forward feeding movement while said screenmoves therethrough; the material being washed and classified during movement in the opposite direction; and the larger particle sizes of the material being caused to roll over said upwardly inclined portion andv off of the screen into the receiving means at that end of its stroke and after the screen has been lifted out of the liquid.

2. A classifying apparatus comprising a reciprocable screen; means to feed material onto said screen; means to receive the classified material which does not pass through said screen; means for supporting a body of liquid; means for sup- '40 porting and directing the movement of said screen to cause the screen to be lifted above the surface of the body of liquid at the end of its reciprocation near the receiving means, and when moving toward the feeding means, to enter the liquid andthen submerge a distance beneath the surface of the liquid whereby the material on the screen will be frictionally engaged by the liquid so that theliquid will push the material across the screen toward the receiving means; said classifier being operative such that the fine material passes through the screen and the coarse matoward the receiving means; said classifier being operative such that the fine material passes through the screen and the coarse material falls over the end of the screen into the receiving means; and means for reciprocating the screen relatively slowly toward the receiving mean and rapidly toward the feeding means whereby as the screen submerges said distance, sufiicient resistance will be generated between the material and the liquid, as the screen moves toward the feeding means, to advance the material-toward the receiving means.

i. A classifying apparatus including a, frame comprising a reciprocable screen; means to feed material onto saidvscreen; means to receive the classified material which does not pass through said Screem'means for supporting a body of liquid; means for supporting said screen comprising a plurality of links pivotally mounted between said screen and said frame, said links directing the movement of said screen to cause 'the screen to be lifted above the surface of the body of liquid at the end of its reciprocation near liquid will push the the receiving means, and when moving toward the feeding means, to enter the liquid and then submerge a distance beneath the surface of the liquid whereby the material on the screen will be frictionally engaged by the liquid so that the material across the screen toward the receiving means; said classifier being operative such that the fine material passes through the screen and the coarse material falls over the end of the screen into the receiving means; and means for reciprocating the screen relatively slowly toward the receiving means and rapidly toward the feeding means whereby as the screen submerges said distance, sufilcient resistance vwill be generated between the material and the liquid, as the screen moves toward the feeding means, to advance the material toward the receiving means.

5. A classifier having means to feed material to the classifier and a means to receive a portion of the classified material comprising a screen reciprocable between said feeding means and said receiving means to effect a separation of the particles of the material to be classified such that the largerparticles-are retained onthe screen;

- ,said screen being generally horizontally disposed terialfalls ever the end of the screen into the 4 receiving means; and means for reciprocating the screen relatively slowly toward the receiving means and rapidly toward the feeding means whereby as the screen submerges said distance, sufllcient resistance will be generated between the material and the liquid, as the screen moves advance the material toward the receiving means.

3. 'A classifying apparatu comprising a reciprocable screen; means to feed material onto said screen; means to receive the classified material which does not pass through said screen; means for supporting a body of liquid; means 'for supporting and directing the movement of said screen through an arcuate path to cause the screen to be lifted above the surface of the. body of liquid at the end of its reciprocation near the receiving means, and when moving toward the feeding means, to enter the liquid and then submerge a distance beneath uid whereby the'material the surface of the liqon the screen will be frictionally engaged by the liquid so that the liquid will push the material acros the screen but having an upwardlyinclined portion adjacent said receiving means; means to drive said screen rapidly in one direction; a body of liquid cooperating with said screen; means for directing the movement of the screen in an arcuate path through said liquid for a substantial distance; said directing means causing said screen to be lifted out of the body of liquid adjacent said receiving means; and means associated with the screen to constrain the material to a path of movement over the screen as it is reciprocated; said drive means being operative to move said screen rapidly from its position nearest the receiving means to the position nearest the feeding means; whereby the material on the screen is subjected to a thorough agitation upon strik ing the liquid, is washed and given a forward feeding mpvement while said screen moves therethrough; the material being washed and classified during movement in the opposite the larger particle sizes of the material being caused to roll over said upwardly inclined portion and off-of the screen into the receiving means at'that end of its stroke and after the screen has been lifted out'of the liquid.

-6. A classifier including a frame and having direction; and

means to feed material to the classifier and a means to receive a'portion of, th classified material comprising a screen reciprocable between said feeding means and said receiving means to effect a separation of the particles of the material to be classified such that the larger particles are retained on the screen; said screen being generally horizontally disposed but having an upwardly inclined portion adjacent said receiving means; meansto drive said screen rapidly in one direction; a body of liquid cooperating with said screen; means comprising a plurality of pivotally mounted links between said screen and said frame for directing the movement ofthe screen through said liquid for a substantial distance; said directing means causing said screen to be llited out of the body of liquid adjacent said re- 7 screen to constrain the material to a path of calving means: and means associated with the movement over the screen as it is reciprocated: said drive means being operativeto move said screen rapidly from its position nearest the receiving means to the position nearest the feedin means; whereby the material onthe screen is subjected to a thorough agitation upon striking the liquid, is washed and given a forward feeding movement while said screen moves therethrough; the material being washed and classified during movement in the opposite direction; and the larger particle sizes of the material being caused to roll over said upwardly inclined portion and 01f of the screen into the receiving means at that end of its stroke and after the screen has been lifted out of the liquid.

JESSE PANKEY HALL. 

